I have seen a structure as below

- models
  - __init__.py
  - user.py

models/__init__.py

from sqlalchemy.orm import declarative_base
Base = declarative_base()
from .user import User

and

models/user.py

from sqlalchemy.orm import Mapped, mapped_column

from . import Base

class User(Base):
    __tablename__ = "user"

    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True, index=True)
    username: Mapped[str] = mapped_column(index=True, unique=True)
    slug: Mapped[str] = mapped_column(index=True, unique=True)
    email: Mapped[str] = mapped_column(index=True, unique=True)
    first_name: Mapped[str]
    last_name: Mapped[str]
    hashed_password: Mapped[str]
    is_superuser: Mapped[bool] = mapped_column(default=False)

I can see Base is imported in user.py and again in __init__.py user is import

How will this be handled in SqlAlchemy

the above code i saw in: https://github.com/ThomasAitken/demo-fastapi-async-sqlalchemy/tree/main/backend/app/models